After the update of Chapter 4, Elite Skills can now be more easier to obtain by doing quests that give "Old Bag" in Coast of Opportunity and Xaviera. Old Bags gives you a random Elite Skill Certificate depending on what level elite skill you don't have. The number of times you can do these quests is limitless.

Level 50

1. Fearlessness of the Arkana
Infernal Blackhorn x3 from Blackhorn Dorglas, Blackhorn Trotter and Blackhorn Silencer at Pasper's Shrine in Sascilia Steppes
Premature Soul Death x 2 from from Krodamar and Krodamon in the Necropolis of Mirrors in Aslan Valley

2. Ambition of the Arkana
Get Frost Energy from Frost Energy Guardians in the Ystra Labyrinth Instance
Get a Flame Core from Flame Rune Knights in the Ystra Labyrinth Instance

- Evil Spirit Cry x1
Go to Mystic Altar Instance in Ystra Highlands and use the Flame Core on the Evil Ice Spirit

- Fire Attack x1
Go to the second Ice Dwarf Kingdom Instance (IDK50) in Dragonfang Valley and use the Frost Energy on Thynos

5. Toughness of the Arkana
- Collect Feather of Raichika the Destroyer 1x from Raichika the Destroyer in the Royals' Refuge in Ystra Labyrinth
- Collect Cactus Needle 1x from Cactus bosses in Dust Devil Canyon

6. Most Important Part (Rune Energy Infuser)
A. Talk to D’Monk Jarfur in Central Plaza, Varanas to get a Rune Extractor that turns into a Rune Energy Infuser after 15 days
B. Talk to Noab Lucerne in Central Plaza, Varanas to buy a Rune Extractor for 500 Phirius Tokens, 10-day countdown

7. Class Specific

Soul of the Arkana: Druid
Talk to Selinwat in the Origin Instance, Aslan Valley
Kill a level 50 mob?

Soul of the Arkana: Knight
Collect Recording Crystal 10x
Talk to Hersibi Taylor in a cave between between the Zurhidon Camp and the Sathkur Ruins in Sascilia Steppes
"aggro 10 mobs and pull them to a guy who will kill them for you. - (ty sniperbob613)"

Soul of the Arkana: Mage
Kill Terbithia's Prisoner 10x
Go to the Rose Caravan in Sascilia Steppes and turn North
Break the Magical Barrier Amphora and kill 10 Terbithia's Prisoner

Soul of the Arkana: Priest
Talk to Horatio Gerter at the Big Dig in Dust Devil Canyon
Kill a level 50 mob

Soul of the Arkana: Scout
Talk to Charly Morph in Silverspring
"Go nearby the road that leads from Silverspring to Ravenfell. There is a grassland next to the lake there. Walk along the northern side"
Kill a level 50 mob

Soul of the Arkana: Warrior
Go to Ghost Town in north-east Ravenfell
"talk to the incarnation of Iron Rune Warrior, and kill him.
Note: He has magic damage immunity, and there will be Cavies with magic immunity who run up to him.
If they get to him they will heal him.
They will all drop regeneration sigils so you should never be at a loss for hp. - (ty sniperbob613)"